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is a significant concern for physicians. Central5 Y( F' b& c3 D5 S3 f) [1 o
precocious puberty (CPP), which is mediated9 x" F0 b5 H- y% ]
through the hypothalamic pituitary gonadal axis, has3 K- V. [5 b" \/ S+ L5 a5 S+ ]! k( C
a higher incidence of organic central nervous system0 `4 M( V. L. G) y# Z+ P( O
lesions in boys.1,2 Virilization in boys, as manifested# z! _1 O1 J5 |9 O
by enlargement of the penis, development of pubic% l3 G" L, `; T! |: Z
hair, and facial acne without enlargement of testi-
9 \( ` O0 h Fcles, suggests peripheral or pseudopuberty.1-3 We) D0 {7 x+ U! @+ V1 R( |. @
report a 16-month-old boy who presented with the
: G H i$ F" s7 h# ^/ Genlargement of the phallus and pubic hair develop-
|1 S ~# [/ b' v: _/ F3 F4 Hment without testicular enlargement, which was due
( N) }3 U: k: V3 n/ \0 C" nto the unintentional exposure to androgen gel used by/ K+ N$ L) Z+ [% D$ B
the father. The family initially concealed this infor-
+ \; |8 V- {3 l f1 amation, resulting in an extensive work-up for this
4 x* d8 A& v8 B" E- k& o, rchild. Given the widespread and easy availability of6 } }: j7 t5 |- d
testosterone gel and cream, we believe this is proba-! A R$ \* s7 d5 ~: `
bly more common than the rare case report in the
! n( O7 S- i2 o. t+ {literature.4% h; J% Y H! _3 m6 V$ O" L
Patient Report ]8 l% i. t3 A5 r
A 16-month-old white child was referred to the+ O0 |6 j1 _+ c
endocrine clinic by his pediatrician with the concern
4 s2 J2 D- \+ n# pof early sexual development. His mother noticed
$ G: S2 G+ p' y" v9 xlight colored pubic hair development when he was9 w5 s) ~. z" c2 `+ T
From the 1Division of Pediatric Endocrinology, 2University of, d* O2 G& q1 |& ?7 N* _. m% P( x4 k7 }
South Alabama Medical Center, Mobile, Alabama.
. M7 E# {% T. J* zAddress correspondence to: Samar K. Bhowmick, MD, FACE,! V6 q6 o7 v+ n% R
Professor of Pediatrics, University of South Alabama, College of
" ^6 g, N/ Q1 p1 m' ZMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;) ^7 p8 i! Q2 N2 h7 p$ ]
e-mail: [email protected].
6 K$ @- n9 a. D' ?, D9 U. |about 6 to 7 months old, which progressively became
* }6 s5 b1 a2 J9 F/ ]darker. She was also concerned about the enlarge-$ t, d) R" ` X- Z: c
ment of his penis and frequent erections. The child8 i3 K- ?) U. t( G6 }/ r2 b' L( M* z3 Z
was the product of a full-term normal delivery, with
3 |8 N, S, z9 X: W8 D/ Ua birth weight of 7 lb 14 oz, and birth length of
* T8 k$ _1 U1 x$ Q T7 K. b! o7 g20 inches. He was breast-fed throughout the first year! s5 }+ T, N- w' b1 E5 r& i4 ^
of life and was still receiving breast milk along with9 i- |8 [$ g5 U. p& S) h
solid food. He had no hospitalizations or surgery,5 b) h4 L* `- K/ T1 @3 X# X3 \
and his psychosocial and psychomotor development6 I( K# W& w3 G" h7 L* \# R
was age appropriate.& I' ^' g. A1 _; O; G& P
The family history was remarkable for the father,. u7 V- B. V. L) r) ^$ E
who was diagnosed with hypothyroidism at age 16,- @( j- o; z' x |% V9 S
which was treated with thyroxine. The father’s
, Z$ o# j: a1 q0 L% u Bheight was 6 feet, and he went through a somewhat) n) @3 P, @7 d9 J
early puberty and had stopped growing by age 14.
$ A0 Y5 }, ~- [, |( e+ Z- R+ |3 MThe father denied taking any other medication. The
. w$ X/ p$ y) n+ c, |child’s mother was in good health. Her menarche
: D! p9 _! k& t" Owas at 11 years of age, and her height was at 5 feet: v9 Z" [/ N- d. t/ C. @
5 inches. There was no other family history of pre-
9 F& b1 m3 V$ |4 c }9 U$ ^. Fcocious sexual development in the first-degree rela-: _' d% C5 S9 s. z2 O; u5 P/ Z' M0 a( O
tives. There were no siblings.9 h' S' P; B' F& H B# z8 a
Physical Examination- j6 I+ q8 ^6 E: `7 m5 W: ^
The physical examination revealed a very active,
1 f* \+ W# d; jplayful, and healthy boy. The vital signs documented
' d1 {# @3 M/ ya blood pressure of 85/50 mm Hg, his length was5 B7 F c& \# V* @7 \( g( S
90 cm (>97th percentile), and his weight was 14.4 kg8 ^% ~5 `% S% y, F6 A
(also >97th percentile). The observed yearly growth) ~4 U* h* n# T1 y6 C8 r& U0 J
velocity was 30 cm (12 inches). The examination of
" J' Y& T! P" H5 ~2 X- Xthe neck revealed no thyroid enlargement., Z( M: S: [: g8 @- e2 B" \
The genitourinary examination was remarkable for
! C" r' [, e/ c( D/ benlargement of the penis, with a stretched length of
" X: i: D3 |& {% c( H, ]6 Z& z8 cm and a width of 2 cm. The glans penis was very well0 H; W( p1 L1 K7 a4 v X5 a! ?# G
developed. The pubic hair was Tanner II, mostly around/ L% K. B2 P7 ?3 b G* B" Y
540 @8 f5 {( ?0 @1 a# P4 ^
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from) _! H/ k3 q% m; r1 |
the base of the phallus and was dark and curled. The
4 l4 i O* B& x/ a2 Ftesticular volume was prepubertal at 2 mL each.# d* w/ c& l% y) o
The skin was moist and smooth and somewhat& }9 | m7 O o
oily. No axillary hair was noted. There were no
) H% N; |5 Y7 u- Xabnormal skin pigmentations or café-au-lait spots.
9 |( {2 [6 _# _Neurologic evaluation showed deep tendon reflex 2+
( ^% K1 s, J9 L$ ]bilateral and symmetrical. There was no suggestion
' g& d# P3 {* _of papilledema.: o+ m7 q, a8 P% H n! @1 U: p
Laboratory Evaluation
. Z4 y7 r5 r! H" W2 oThe bone age was consistent with 28 months by
h- K# @) g. n1 u0 `' Wusing the standard of Greulich and Pyle at a chrono-% v( f! D0 q9 t: T3 W- U
logic age of 16 months (advanced).5 Chromosomal. ]0 t% r! Z U& k* `. I: w
karyotype was 46XY. The thyroid function test
( A2 V4 }2 B: e& k, ?, mshowed a free T4 of 1.69 ng/dL, and thyroid stimu-8 W' J6 Z7 G, R' M4 D: S( ~% k
lating hormone level was 1.3 µIU/mL (both normal).
( L* ^5 F) u6 h: J3 AThe concentrations of serum electrolytes, blood" H' N+ J% g7 t2 ~- k( [
urea nitrogen, creatinine, and calcium all were
; v- d( Q" Z( I! q( h, g7 l, k( Rwithin normal range for his age. The concentration V p4 y9 `8 D; s, W
of serum 17-hydroxyprogesterone was 16 ng/dL5 v7 e' H& S" B& ^1 {/ Q( @
(normal, 3 to 90 ng/dL), androstenedione was 20" {. ^/ v5 c l+ j( d
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-+ z8 m3 l* q: @5 X
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
/ u4 X" v6 n7 E& C1 Fdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
; L8 B8 j) q9 a49ng/dL), 11-desoxycortisol (specific compound S). Q/ R7 ?. N) J2 p0 W" L
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
~2 [( c, Y7 V8 v% F& n6 utisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
5 B r7 K: y/ V/ r1 atestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
0 A- z+ u9 ^) z2 H3 aand β-human chorionic gonadotropin was less than
1 S. l9 W) T, ^. j6 ~9 S" {0 S2 ~. G" E6 X5 mIU/mL (normal <5 mIU/mL). Serum follicular
4 O: }) q+ ]0 x. l# I. k2 Y- b- jstimulating hormone and leuteinizing hormone: M$ K' n- S" E1 l7 I0 P/ l G$ {& v
concentrations were less than 0.05 mIU/mL/ P: g$ X, W' N2 x: p4 G
(prepubertal).6 i4 V$ S+ ^0 Z0 p
The parents were notified about the laboratory
/ N1 } w! L: Jresults and were informed that all of the tests were
6 m& ^! C4 ]8 R. K4 m9 knormal except the testosterone level was high. The* U" V# i' g% j4 t6 @3 Q
follow-up visit was arranged within a few weeks to$ D' E" D: G( n& {) F9 G! a
obtain testicular and abdominal sonograms; how-0 \0 P G4 m+ s4 d. ?) i
ever, the family did not return for 4 months.
/ U) G, T" |6 qPhysical examination at this time revealed that the
7 s e j' k; c' I; w) N9 fchild had grown 2.5 cm in 4 months and had gained
' U/ ^, ?8 H; U# z" a* w2 kg of weight. Physical examination remained9 m% V+ n; _) N
unchanged. Surprisingly, the pubic hair almost com- D" `( Z8 {/ [% X/ P+ o: y* q
pletely disappeared except for a few vellous hairs at- F+ n. L3 l6 c# c
the base of the phallus. Testicular volume was still 2
. X5 {/ Z5 K( r4 HmL, and the size of the penis remained unchanged.3 M. j/ c& W6 ]8 k
The mother also said that the boy was no longer hav-
; ~( x( K, g% i8 H8 M `& Bing frequent erections.
. J9 v& p @: l7 tBoth parents were again questioned about use of U( L1 R; N2 q. h
any ointment/creams that they may have applied to
, ~6 {8 q, {$ Dthe child’s skin. This time the father admitted the( E8 b" ^- M# G A- f; a5 p
Topical Testosterone Exposure / Bhowmick et al 5415 Q' l) C' R6 c8 S; I1 v% y
use of testosterone gel twice daily that he was apply-
( k, j1 Y: G! K; F& Ping over his own shoulders, chest, and back area for7 K1 i8 ?! H& D! J9 ]' J4 |/ u
a year. The father also revealed he was embarrassed" k6 O' Y2 B. o' A& L( U i
to disclose that he was using a testosterone gel pre-6 P" y: ]$ h7 P1 F) J, t8 Q
scribed by his family physician for decreased libido4 w, u; x$ S7 w) M, I
secondary to depression.# x; ^. V4 V1 \3 l7 l0 r; b
The child slept in the same bed with parents.
& T% Q* B: A% H/ l! s4 c, \; NThe father would hug the baby and hold him on his
$ y( E: A* H. W& Y/ A' A* s( ]chest for a considerable period of time, causing sig-8 z/ K8 m6 @+ X% ~. r& Z1 ^" a
nificant bare skin contact between baby and father.
' U5 ~ P7 `0 W2 Q9 M$ bThe father also admitted that after the phone call,
m$ b/ C X; M- N' u; Xwhen he learned the testosterone level in the baby
6 k& o0 e" J, l0 J6 f, M9 Uwas high, he then read the product information/ a2 r7 y. v% H! b
packet and concluded that it was most likely the rea-
* S5 o' P, ]+ \3 \+ p/ ~, x9 x& Yson for the child’s virilization. At that time, they
]1 M" h# Z" C% l( x4 Ddecided to put the baby in a separate bed, and the
. V/ O I$ |8 h' x' }9 t' C" |) xfather was not hugging him with bare skin and had8 C4 d4 W; c$ Y$ U* p0 q4 N7 m
been using protective clothing. A repeat testosterone
3 m. A- E5 |5 x% }" a5 K. `' h6 Ftest was ordered, but the family did not go to the; b" M" ?8 w8 P/ p
laboratory to obtain the test." N5 S0 d! E" d3 r: e q1 r# p# S
Discussion
8 h1 q5 [. J; c3 ^3 ?% tPrecocious puberty in boys is defined as secondary) [" J# J7 m* \, E9 {3 i7 N/ g
sexual development before 9 years of age.1,4( [. j; W( K f1 F
Precocious puberty is termed as central (true) when
5 v/ K: T2 O# jit is caused by the premature activation of hypo-
0 y" X* d* [5 |8 {8 ?. Bthalamic pituitary gonadal axis. CPP is more com-( E5 d- Y& g% X, O" j
mon in girls than in boys.1,3 Most boys with CPP
$ ?' [. d F: Xmay have a central nervous system lesion that is1 }; E" C" Z$ {% X
responsible for the early activation of the hypothal-4 {+ ^* l! k- }6 I4 N
amic pituitary gonadal axis.1-3 Thus, greater empha-8 A: a8 c, \0 M9 ?3 _9 F9 E7 ]
sis has been given to neuroradiologic imaging in
' g" q+ ?! s5 ?, v. i/ G$ Cboys with precocious puberty. In addition to viril-! x. p/ h3 H8 F2 ?% [3 V* g
ization, the clinical hallmark of CPP is the symmet-
! ?4 c$ E5 n S8 @ f' Wrical testicular growth secondary to stimulation by
" q% k6 U, u' t. \ tgonadotropins.1,3
1 t' E* y& O3 k R; B! oGonadotropin-independent peripheral preco- u% h% g* O1 g) k
cious puberty in boys also results from inappropriate
8 w0 p4 W: ~9 tandrogenic stimulation from either endogenous or
- _& A8 N! c2 n4 s# @- E4 E( pexogenous sources, nonpituitary gonadotropin stim-" A$ c" o) f' t) u1 \
ulation, and rare activating mutations.3 Virilizing
7 K h! ~+ ?3 w& ~) ]congenital adrenal hyperplasia producing excessive
8 ^7 W% {: ?) O4 j) V$ \adrenal androgens is a common cause of precocious0 ~) Q: v: t0 }: ^: c3 w) U
puberty in boys.3,4
8 k6 y; n# c" \The most common form of congenital adrenal& e% I4 n/ n \6 i3 {
hyperplasia is the 21-hydroxylase enzyme deficiency.9 m4 u& e, g) y2 d
The 11-β hydroxylase deficiency may also result in c# B% D6 Q' W7 {! C; [# D6 W7 m
excessive adrenal androgen production, and rarely,8 W# T' R* s. j6 l( `5 b
an adrenal tumor may also cause adrenal androgen `) @9 y9 l, w, [
excess.1,3
0 B7 I, X" \) w3 C3 u: \8 p! ]& hat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from5 y7 r4 d* h5 q/ ]+ |
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
8 S& g+ Y3 m6 z. v0 iA unique entity of male-limited gonadotropin-
/ S4 {/ r# k2 h6 J7 jindependent precocious puberty, which is also known
: ^9 [$ R; C5 u; ?/ ]) vas testotoxicosis, may cause precocious puberty at a
2 O# i: q X! z" S, xvery young age. The physical findings in these boys: s* ]- c& v# W+ ?5 t5 w
with this disorder are full pubertal development,
6 i7 a9 [2 { a0 C4 U: n% Gincluding bilateral testicular growth, similar to boys
6 }4 F9 n) E+ l; m. R+ c+ k" l) ywith CPP. The gonadotropin levels in this disorder) G% ^: I: T% y( R% P
are suppressed to prepubertal levels and do not show" e3 u) H7 r9 \$ U3 U3 O
pubertal response of gonadotropin after gonadotropin-$ L b' n9 L4 h. j0 L
releasing hormone stimulation. This is a sex-linked5 o5 T: Y/ F2 x* Q) G
autosomal dominant disorder that affects only
: ^$ a9 M, E3 a. o7 j/ n' {' Qmales; therefore, other male members of the family6 [+ t$ B' N: Y7 E4 U9 S# ~, v
may have similar precocious puberty.3
4 [- ~4 v M0 B6 O" i4 |6 a CIn our patient, physical examination was incon-: [: ?3 t. ^! C. i: _% X( [
sistent with true precocious puberty since his testi-
& E% X* I& A. r2 C6 }6 b1 z0 U- _ gcles were prepubertal in size. However, testotoxicosis
7 |. Q. L/ w8 J& ^) B# q, D+ s3 Rwas in the differential diagnosis because his father0 u2 ~, g# C1 i/ m0 p8 M0 T; Z0 h
started puberty somewhat early, and occasionally,
* `. i$ D6 }" |7 K8 f& b6 H) g Otesticular enlargement is not that evident in the
/ e3 w: S( V7 G( jbeginning of this process.1 In the absence of a neg-2 ~2 E" d& H2 H
ative initial history of androgen exposure, our1 p! j+ D8 I3 g5 m; f
biggest concern was virilizing adrenal hyperplasia,
, u: P# O* F% h* e) q' }0 a% Keither 21-hydroxylase deficiency or 11-β hydroxylase
* W5 a) p. e4 a7 j8 T- m; q5 Sdeficiency. Those diagnoses were excluded by find-
. b( Y& F* G3 I' w/ d7 M9 xing the normal level of adrenal steroids.
) p1 n' ^3 u) q3 l' v; xThe diagnosis of exogenous androgens was strongly
: S- C* a% w& a) [1 u2 d* z$ Vsuspected in a follow-up visit after 4 months because; `5 ~2 y' {3 U# _
the physical examination revealed the complete disap-
@' B$ v7 H4 J: U1 Kpearance of pubic hair, normal growth velocity, and
! {1 C% E! \* m* Y( wdecreased erections. The father admitted using a testos-5 D- u+ I6 W/ Y4 q- i
terone gel, which he concealed at first visit. He was& P1 a4 Y; N- \. M" a5 g6 {
using it rather frequently, twice a day. The Physicians’
& v2 h9 \ Q4 z5 RDesk Reference, or package insert of this product, gel or
# m( |. K4 B8 w& Z: b" Rcream, cautions about dermal testosterone transfer to
- M$ r, }) {* s/ wunprotected females through direct skin exposure.
& C% H, K! c8 L% V; z! G6 jSerum testosterone level was found to be 2 times the
$ Y3 D- p7 v4 `+ k( obaseline value in those females who were exposed to) c% x' I0 I7 ~' }5 ~
even 15 minutes of direct skin contact with their male
8 h* B( T# H$ G, f% xpartners.6 However, when a shirt covered the applica-, L- d" F0 p! `' q: s% R) q
tion site, this testosterone transfer was prevented.
/ a9 b/ j6 n/ l2 ]Our patient’s testosterone level was 60 ng/mL,
v1 ?6 b# q) m. O o- v' {which was clearly high. Some studies suggest that9 Q( b; @1 r( S' P" |
dermal conversion of testosterone to dihydrotestos-
5 `/ E& W8 ?# ~0 o, W. Hterone, which is a more potent metabolite, is more
2 F0 M0 E$ q- D: }( s N1 Yactive in young children exposed to testosterone( N7 C0 }% H. k- e
exogenously7; however, we did not measure a dihy-
; X- [; t) A$ V' g2 Z @drotestosterone level in our patient. In addition to
' y% o( e" P% J( S/ W7 Q5 Mvirilization, exposure to exogenous testosterone in
$ ~$ H3 \; m8 y5 i! m/ L1 ?2 zchildren results in an increase in growth velocity and
2 I$ [4 I( h) u$ Y4 e1 {. Padvanced bone age, as seen in our patient.0 E& ^& s# G" w* H) s6 p
The long-term effect of androgen exposure during
4 e! h/ ^4 C' D4 searly childhood on pubertal development and final6 C" _* p m/ S* |5 ~* A) w
adult height are not fully known and always remain, G5 d" o4 J5 `4 U- ?2 y
a concern. Children treated with short-term testos- G# u- @1 A6 [/ Y4 h6 ]
terone injection or topical androgen may exhibit some
. i$ w& Y" m; i- F% h7 Vacceleration of the skeletal maturation; however, after1 ?- J9 n, O0 l+ {! t
cessation of treatment, the rate of bone maturation
; [. e7 m) l: Y5 @; [: \( [8 xdecelerates and gradually returns to normal.8,9, j+ T$ h1 P7 p" H2 s2 ]& u4 b; i
There are conflicting reports and controversy
. X/ `, k$ `) _, q* yover the effect of early androgen exposure on adult
4 N$ n3 M- f0 k# O( ipenile length.10,11 Some reports suggest subnormal4 k& K3 C5 j" ?; m h* S
adult penile length, apparently because of downreg-) ~. A7 ?' S1 U7 Y9 i
ulation of androgen receptor number.10,12 However, a! x1 W; o" | F$ R. x, \& G4 w
Sutherland et al13 did not find a correlation between P* T0 g4 k- w; b; t/ A7 U
childhood testosterone exposure and reduced adult% K/ t Z' o4 x
penile length in clinical studies.: e) }1 R. A: C% ?
Nonetheless, we do not believe our patient is T5 ?1 @2 M$ Q* W2 o1 F1 v
going to experience any of the untoward effects from
0 { L' _2 U- D4 Q+ Dtestosterone exposure as mentioned earlier because
3 X6 V/ i! ]; E- J; hthe exposure was not for a prolonged period of time.
9 {/ h1 J1 W1 b% j) ^% M) ZAlthough the bone age was advanced at the time of7 i4 _ y4 s* K+ n" X
diagnosis, the child had a normal growth velocity at
# [# F& q6 E G2 J, Y3 B9 N+ dthe follow-up visit. It is hoped that his final adult
7 W \# O" j/ o- e/ d H" yheight will not be affected.
7 ?) a, w- N5 K& qAlthough rarely reported, the widespread avail-
8 E- @0 l9 C" |) C* T1 y5 bability of androgen products in our society may
* S. ~1 f% g8 X# P! b, s! j5 uindeed cause more virilization in male or female$ u8 }: b7 M* m- h4 L. g: s$ L4 a
children than one would realize. Exposure to andro-3 E- i: j3 k4 H( H2 n! ?
gen products must be considered and specific ques-7 n- Y/ M. i! |' s% A
tioning about the use of a testosterone product or. K6 j% w% Y2 b% y! R8 N7 z4 i! z
gel should be asked of the family members during
. ~9 I9 e% P- M, W! p3 W! Ythe evaluation of any children who present with vir-% d7 k0 J: L. x: ^5 B4 D
ilization or peripheral precocious puberty. The diag-! G. x2 P4 ~3 F
nosis can be established by just a few tests and by+ G1 Y9 C$ E$ s/ N0 {* d! K
appropriate history. The inability to obtain such a8 [- {) F: E5 n/ P: p
history, or failure to ask the specific questions, may
+ \0 S, Z4 k& i7 c! p- q( p9 E# Gresult in extensive, unnecessary, and expensive; X8 x3 f+ r. c+ w/ e$ n5 k- i8 w" l& Q
investigation. The primary care physician should be" R) s2 f9 B6 Y0 y+ ~/ H7 r% T
aware of this fact, because most of these children
0 Y0 {2 b) J" ?! Vmay initially present in their practice. The Physicians’1 h5 y/ }3 J0 r% B4 c9 [& H
Desk Reference and package insert should also put a
' _/ _% L! ~$ r% [ iwarning about the virilizing effect on a male or( v. P1 A# C! l( e( o K3 E* a
female child who might come in contact with some-* Z7 u+ d* T# ]% h9 i4 k
one using any of these products.8 _9 K5 P; U# z& S$ Y* d; ~& M
References
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! K. e/ Y9 {$ z( |2002: 565-628." o3 N; ~+ o/ e/ b
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